' Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers SCRIPTION The is low-power transceivers for RS-485 and RS-422 communication. IC contains one driver and one receiver. The driver slew rates of the is not limited, allowing them to transmit up to 2.5Mbps. These transceivers draw between 120μA and 500μA of supply current when unloaded or fully loaded with disabled drivers. All parts operate from a single 5V supply. Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. The is designed for halfduplex applications. SOP-8 FEATURES Low Quiescent Current: 300μA -7V to +12V Common-Mode Input Voltage Range Three-State Outputs 30ns Propagation Delays, 5ns Skew Half-Duplex Versions Available Operate from a Single 5V Supply Allows up to 32 Transceivers on the Bus Data rate: 2.5 Mbps Current-Limiting and Thermal Shutdown for Driver Overload Protection TRUTH TABLE Transmission Inputs Outputs RE A B X 1 1 1 0 X 1 0 0 1 0 0 X Z Z 1 0 X Z Z Receiver Inputs Outputs Pin Configuration and Logic Diagram RE A-B RO 0 0 +0.2V 1 0 0-0.2V 0 RO 1 R 8 VCC 0 0 Open 1 1 0 X Z RE 2 7 B 3 6 A 4 D 5 GND OCT. 2015_Preliminary - 1 - HTC
Ordering Information Package Oder No. Description Marking Compliance Status SOP-8 ED RS-485/RS-422 Transceivers E RoHS, Green Active TJ 485 Package Type - D : SOP-8 T A - E : -40 ~ 85 Root Name Product Code OCT. 2015_Preliminary - 2 - HTC
Absolute Maximum Ratings Characteristic Symbol Min Max Unit Supply Voltage V CC 12 V Control Input Voltage V, V RE -0.5 V CC + 0.5 V Driver Input Voltage V -0.5 V CC + 0.5 V Driver Output Voltage A, B -8 12.5 V Receiver Input Voltage A, B -8 12.5 V Receiver Output Voltage V RO -0.5 V CC + 0.5 V Storage Temperature Range T STG -65 150 Operating Ratings Characteristic Symbol Min Max Unit Supply Voltage V CC 4.75 5.25 V Operating Temperature Ranges T A -40 85 OCT. 2015_Preliminary - 3 - HTC
PIN CONFIGURATION RO 1 8 VCC RE 2 ED 7 B 3 6 A 4 5 GND PIN SCRIPTION Pin No. Symbol Pin Descriptions 1 RO Receiver Output 2 RE* Receiver Output Enable 3 Driver Output Enable 4 Driver Input 5 GND Ground 6 A Non-inverting Driver Output and Receiver Input 7 B Inverting Driver Output and Receiver Input 8 V CC Power Supply: 4.75V to 5.25V OCT. 2015_Preliminary - 4 - HTC
ELECTRICAL CHARACTERISTICS Unless otherwise specified: V CC = 5V ± 5%, T A = T MIN to T MAX PARAMETER Symbol CONTIONS MIN TYP MAX UNITS Differential Driver Output (no load) V OD1 5 V Differential Driver Output R = 50Ω (RS-422), Figure 1 2 V OD2 (with load) R = 27Ω (RS-485), Figure 1 1.5 5 V Change in Magnitude of Driver Differential Output Voltage for ΔV OD R = 27Ω or 50Ω, Figure 1 0.2 V Complementary Output States Driver Common-Mode Output Voltage V OC R = 27Ω or 50Ω, Figure 1 3 V Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States ΔV OC R = 27Ω or 50Ω, Figure 1 0.2 V Input High Voltage V IH,, RE 2.0 V Input Low Voltage V IL,, RE 0.8 V Input Current I IN1,, RE ±2 ua Input Current (A, B) Receiver Differential Threshold Voltage I IN2 = V CC = or 5.25V V IN = 12V 1.0 V IN = -7V -0.8 V TH -7V V CM 12V -0.2 0.2 V Receiver Input Hysteresis ΔV TH V CM = 70 mv Receiver Output High Voltage V OH I O = -4mA, V ID = 200mV 3.5 V Receiver Output Low Voltage V OL I O = 4mA, V ID = -200mV 0.4 V Three-State (High Impedance) Output Current at Receiver I OZR 0.4V V O 2.4V ±1 ua Receiver Input Resistance R IN -7V V CM 12V kω No-Load Supply Current ICC RE = or V CC =V CC 500 900 = 300 500 ua Driver Short-Circuit Current, V O = High I OSD1-7V V O 12V 35 250 ma Driver Short-Circuit Current, V O = Low I OSD2-7V V O 12V 35 250 ma Receiver Short-Circuit Current I OSR V O V CC 7 95 ma ma OCT. 2015_Preliminary - 5 - HTC
SWITCHING CHARACTERISTICS Unless otherwise specified: V CC = 5V ± 5%, T A = T MIN to T MAX PARAMETER Symbol CONTIONS MIN TYP MAX UNITS Driver Input to Output t PLH R L = 54Ω 10 30 60 ns t PHL C L = 100pF 10 30 60 ns Driver Output Skew to Output t SKEW R L = 54Ω, C L = 100pF 5 10 ns Driver Enable to Output High t ZH C L = 100pF, R L = 1KΩ 40 70 ns Driver Enable to Output Low t ZL C L = 100pF, R L = 1KΩ 40 70 ns Driver Disable Time from Low t HZ C L = 15pF, R L = 1KΩ 40 70 ns Driver Disable Time from High t LZ C L = 15pF, R L = 1KΩ 40 70 ns Receiver Input to Output tplh - tphl Differential Receiver Skew Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable Time from Low Receiver Disable Time from High t PLH 20 185 200 ns C L = 15pF t PHL 20 185 200 ns t SKD C L = 15pF 5 10 ns t ZL C L = 15pF 20 50 ns t ZH C L = 15pF 20 50 ns t LZ C L = 15pF 20 50 ns t HZ C L = 15pF 20 50 ns Maximum Data Rate f MAX 2.5 Mbps OCT. 2015_Preliminary - 6 - HTC
TEST CIRCUITS D V OD R L R L VOC Figure. 1 3V 1.5V 1.5V Y C L t PLH t PHL D R L V O Z V O 1/2V O 1/2V O Y Z V O 90% V FF = V(Y) - V(Z) 90% C L V FF -V O 10% 10% t R t F t SKEW = t PLH t PHL Figure. 2 OCT. 2015_Preliminary - 7 - HTC
VCC D S1 C L R L OUT D S1 C L R L OUT 3V 1.5V 1.5V t ZL,SHDW t LZ 2.3V V OL + 0.5V OUT 2.3V V OH 0.5V t ZH,SHDW t HZ Figure. 3 V OH RI 1.5V V OUTPUT ID RO V OL 1.5V R RE* t C PHL t PLH L V ID INPUT -V ID 1.5V RO Figure. 4 OCT. 2015_Preliminary - 8 - HTC
1.5V -1.5V S1 RI RI* R RO S2 VCC RE* C L 3V 1.5V 1.5V RE* t ZL,SHDW t LZ VCC 1.5V V OL + 0.5V RO 1.5V V OH 0.5V t ZH,SHDW t HZ Figure. 5 OCT. 2015_Preliminary - 9 - HTC
PRELIMINARY REVISION NOTICE The information in this datasheet can be revised without any notice. OCT. 2015_Preliminary - 10 - HTC